Top bench pressers
 

Do they only train benching or do they do other exercises as well? Or squatters deadlifters whatever...

if you see a big bench presser, typically they are a big squatter and dead lifter as well. Usually power lifters do big compound exercises and are strong all around. That does not mean there are not those out there that dont focus on one particular exercise such as bench, squat, or deads, but usually they practice all together since all will only compliment the other and help you increase all your lifts.